Update: Duh! Have just solved this problem myself, but am leaving it here in case it helps someone else! Solution was to use the drop down box at top left of window. When I checked it, realized that the printer fax had been selected (couldn't see this in the window until drop down accessed). I just scrolled down to Printer and ... it printed.
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Trying to print a scanned signature page which is in jpeg format. Whenever I try (on HP All in One OfficeJet Pro), the print request brings up a faxl page instead. Can't seem to get this to work and, because scan came from a new client, don't want to request he rescan in a different format!